Suzaku Observations of the Great Annihilator and the Surrounding Diffuse Emissions

Abstract

We report the Suzaku observation of 1E 1740.7-2942, a black hole candidate called the "Great Annihilator" (GA). The high-quality spectrum of Suzaku provides the severest constraints on the parameters of the GA. Two clumpy structures are found around the GA in the line images of FeI Kalpha at 6.4 keV and SXV Kalpha at 2.45 keV. One clump named M359.23-0.04 exhibits the 6.4-keV line with an equivalent width of ~ 1.2 keV, and is associated with a molecular cloud in the radio CS(J=1-0) map. Thus the 6.4-keV line from M359.23-0.04 is likely due to X-ray fluorescence irradiated by an external X-ray source. The irradiating X-rays would be either the past flare of Sagittarius A* or the bright nearby source, the GA. The other clump named G359.12-0.05 is associated with the radio supernova remnant candidate G359.07-0.02. We therefore propose that G359.12-0.05 is an X-ray counterpart of G359.07-0.02. G359.12-0.05 has a thin thermal plasma spectrum with a temperature of kT ~ 0.9 keV. The plasma parameters of G359.12-0.05 are consistent with those of a single supernova remnant in the Galactic center region.

10 pages, 8 figures, accepted for publication in PASJ (Vol.62, No.4)

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Cited by in corpus (7)

• The XMM-Newton view of the central degrees of the Milky Way
• Diffuse X-Ray Sky in the Galactic Center
• An X-ray survey of the central molecular zone: variability of the Fe Ka emission line
• The Swift Bulge Survey: Motivation, Strategy, and First X-ray Results
• NuSTAR and INTEGRAL observations of a low/hard state of 1E1740.7-2942
• Study of the excess Fe XXV line emission in the central degrees of the Galactic centre using XMM-Newton data
• Spectrum Composition of Galactic Center X-ray Emission with Point and Diffuse X-ray Sources